All Questions
34
questions
6
votes
4
answers
3k
views
How to replace a potentiometer with a digital solution in a buck feedback loop?
I have a simple pre-made buck converter that looks something like this:
The output voltage can be easily adjusted, by turning the R2 trimpot, which adjusts the voltage the feedback pin is getting.
...
- 204
4
votes
8
answers
14k
views
How to drop 240V DC to 5V DC?
I would like to drop a 240V DC voltage to a 5V DC voltage. The 5V stage needs less than 5mA in current.
The solutions I looked at are:
Resistor Divider (Not really interesting because of the power ...
- 179
3
votes
3
answers
1k
views
What will happen if you supply a higher voltage to a buck converter? [duplicate]
The title says enough, but let’s give a real life example too. Take one of those LM2596 35V boards. What will happen to it if it gets 50V on the input?
Most likely it will burn, but will this voltage ...
- 930
2
votes
3
answers
6k
views
Is it better to have a higher Vgs than Vds on a MOSFET (n-channel)?
I've been studying MOSFET switching applications recently, and have been playing with the Circuit Simulator Applet here. In my diagram below, I have Vds usually set to either 12 or 14, as I am trying ...
2
votes
3
answers
9k
views
How to use the power good signal properly?
I'm powering a circuit from a buck converter. I've seen that many buck/boost converters (for example, TPS62177) have a PG or power good output signal which ...
- 211
2
votes
3
answers
75
views
How to use a 49Voc solar panel for USB charging after a calamity (without using proper solar charge controllers)?
Some background first, actual question at the bottom:
Last year December my area in the Philippines was directly hit by a super typhoon, international name: Typhoon Rai.
For three weeks after that ...
- 23
2
votes
2
answers
810
views
LM2596S-ADJ DC to DC buck converter
Does the Schottky diode current rating affect the performance of a DC to DV buck converter when loaded? I'm using a 1N5822 Schottky diode instead of a 1N5825 on a National Semiconductor LM2596S-ADJ ...
1
vote
2
answers
429
views
What is the equivalent of a buck converter for AC voltage?
A have researched and found that a buck converter is used for stepping down voltage in DC applications.
However, my application uses AC current. I have christmas lights that plug into the wall and I ...
- 506
1
vote
4
answers
304
views
Multiple Buck Converters
I have multiple buck converters, model XL4005 (datasheet ), fed from a 12V battery source to several devices i.e. My motors (require 12V), Arduino (requires 5V) and Transmitter module (require 3.3V). ...
- 11
1
vote
3
answers
113
views
Unable to start and run 12 V DC pump, only jolts
I have a 12V 19 watt DC water pump (800LPH), A 12 V DC step down converter, and two Dewalt batteries.
One at 18 V 5 Ah, other 18-54 V 9 Ah.
I've connected pump to step down to battery correctly, but ...
- 23
1
vote
1
answer
439
views
(230v)AC-DC(12v) wall adapter flashes when connected to dc to dc buck converter [closed]
So I used a common 230vAC to 12vDc (1AMP) wall adapter with dc jack like this
and converted to 5v using a dc to dc buck converter same as based on lm2596s
But the adapter LED starts blinking (...
- 123
1
vote
1
answer
3k
views
Upgrading automotive heater blower motor resistors with a PWM based device
My 2004 car has a resistor module attached to the DC heater motor circuit that has three coiled resistance wires (2.1 Ohms, 1.5 Ohms and 1 Ohm), two which have burnt out as only two out of four speed ...
1
vote
1
answer
278
views
Single input dual output simulation help
Ive been using PSIM and there is a problem with the circle mosfet wont turn on. Ive the correct duty cycle and input voltage is higher than the threshold. Can someone simulate it on another simulator ...
- 11
1
vote
1
answer
209
views
Using a capacitor to handle the inrush surge power of a fridge
I have a household mini fridge connected to my off grid electrical system, and recently I bought a smaller inverter just for the fridge so that I can turn my larger inverter off to reduce power ...
- 11
1
vote
1
answer
221
views
BLDC Motor ESC/Controller Analog Receiver PWM/Wiring - Won't detect with potentiometer
I have an RC/drone ESC that takes a PWM input signal at 3.3 V/5 V for throttle control, but has no onboard buck/BEC. I have the illustration below for my current setup.
This motor works excellent with ...
- 59